TM 5-3805-264-13&P
OPERATOR MAINTENANCE
THEORY OF OPERATION
ELECTRICAL SYSTEM
The dump body electrical system consists of wiring harnesses that connect to the vehicle's chassis wiring
harnesses.
The dump body wiring harnesses connect to:
Lights
Taillights and marker clearance lights (one on each side of dump body and three in light cluster at rear hinge) are
located on dump body. Beacon warning light is located on cab shield.
Instrument Panel Indicator/Warning Lights and Related Switches
Body Up and Body (Transport) Lock indicator lights are located on instrument panel in cab. Body Up and
Transport Lock switches are located on cylinder support frame.
Material Control System (MCS) Tailgate (M917A1 with MCS and M917A2 with MCS)
Solenoid-controlled air cylinders open and close MCS gates.
DUMP BODY
Dump Body Assembly
The dump body is a welded assembly of heavy-gauge steel with bolt-on assemblies and components. It is 13.5 ft
(411 cm) long with 14 cu yd (10.7 m), 18.5 ton (16.8 metric ton) capacity.
The dump body is attached to the truck frame at the rear hinge. Other attachment points are at the stabilizer and
the hydraulic cylinder.
An abrasion-resistant steel bed resists wear and denting.
A bolt-on cab shield protects the cab. The beacon warning light is mounted on the cab shield.
Wooden side boards along the top on both sides of the dump body add height to help prevent spillage when
hauling material.
The dump body has an interlocking understructure.
Stabilizer
A hinged stabilizer, mounted between the truck frame and the dump body, adds stability as the dump body is
raised.
Five grease fittings on the stabilizer allow for lubrication.
Body Props
Use of body props permit inspection or maintenance to be safely performed underneath an empty raised dump
body.
Body props are located on outside of truck frame. When not in use, they are stowed in the horizontal position.
A grease fitting on each body prop pivot point allows for lubrication.
Lubrication-Free Bearings
There are composite, lubrication-free bearings with removable pins at the rear hinge and at the hydraulic cylinder
pivot points.
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03/15/2011Rel(1.10)root(thrywp)wpno(G1000326413)
